An ultraviolet ionizing unit for an air purifying that treats all air passing therethrough. The unit has a housing with an air ingress opening at first end, an air egress opening at a second end, an open end, at least two spaced apart internal retainers formed inside the housing, and a cavity formed in a space between the two spaced apart internal retainers. Two sections of ion generating material are retained in a spaced apart manner by the two spaced apart internal retainers. Spacers are used to hold a U-shaped UV lamp in the cavity, provide cushioning of the UV lamp therein, and providing additional sealing so that all air passing through the ionizing unit will be treated. A housing end cap covers the open end of the housing and retains the UV lamps therein so that the ion generating materials is fully exposed by UV light.